Mass and local topography measurements of Itokawa by Hayabusa
Mass and local topography measurements of Itokawa by Hayabusa
复制标题
DOI：
10.1126/science.1126272
复制
发表时间：
2006-06-02
期刊：
影响因子：
56.9
通讯作者：
Yoshikawa, Makoto
中科院分区：
文献类型：
--
作者：
Abe, Shinsuke;Mukai, Tadashi;Yoshikawa, Makoto
隼鸟号航天器上的测距仪测量了小行星25143 Itokawa的表面地形及其质量。一个典型的粗糙区域在粗糙度上类似于小行星433爱神星上一个大陨石坑内壁上的碎片，这表明丝川的表面结构类似于爱神星上的陨石坑喷出物。丝川的质量估计为（3.58 +/- 0.18）x 1010千克，意味着体积密度为（1.95 +/- 0.14）克/立方厘米，体积为（1.84 +/- 0.09）× 10（7）立方米，体积孔隙度约为40%，与角砂相似，当假设一个LL（低铁陨石）陨石组成。结合表面观测，这些数据表明，丝川是第一个亚光速级大小的小行星，显示出一个碎石堆的身体，而不是一个固体单体小行星。
The ranging instrument aboard the Hayabusa spacecraft measured the surface topography of asteroid 25143 Itokawa and its mass. A typical rough area is similar in roughness to debris located on the interior wall of a large crater on asteroid 433 Eros, which suggests a surface structure on Itokawa similar to crater ejecta on Eros. The mass of Itokawa was estimated as (3.58 +/- 0.18) x 1010 kilograms, implying a bulk density of (1.95 +/- 0.14) grams per cubic centimeter for a volume of ( 1.84 +/- 0.09) x 10(7) cubic meters and a bulk porosity of similar to 40%, which is similar to that of angular sands, when assuming an LL ( low iron chondritic) meteorite composition. Combined with surface observations, these data indicate that Itokawa is the first subkilometer-sized small asteroid showing a rubble-pile body rather than a solid monolithic asteroid.